Dear Heloise: I recently found out, to my surprise, that decaffeinated and caffeine-free are not the same. “Decaf” simply means that the coffee or tea has 30-50 percent less caffeine than regular. Thought I’d pass on the information. – Pauline B., Reports show that the majority of the American population cannot go a day without a caffeine shot, so much so that more than $40 billion dollars in a year are spent on coffee alone. Nitro coffee is fairly expensive with regular coffee costing a mere three The evidence suggests that the effects of caffeine go much further than "Our findings also provide a more complete explanation for why it's harder for some people to sleep if they've had a coffee in the evening - because their internal clockwork However, when you drink a has shown that caffeine disrupts body clocks in organisms such as fruit flies, mice and algae. It would then make sense it has a similar effect on humans. However, the study did not look at how morning coffee consumption .